This laboratory exercise examines the response of native birds to different frequencies of a mimic species while holding the other two parameters constant - the degree of distastefulness and the resemblance of the mimic to the model.

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In this laboratory exercise, the following issues are examined: 1) why neither predators nor prey go extinct when there is a long period of nonrenewal of the prey population 2) the effects of habitat on foraging speed 3) the advantages foragers can gain from experience in foraging 4) the advantage of exclusive use of an area for foragers 5) the effects of food density on foraging speed 6) the...

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In this Experiment, students make impressions of leaf stomata (using clear nail polish) and test a hypothesis of their choice about how leaf stomata density might vary under different environmental conditions. Leaf stomata are the principal means of gas exchange in vascular plants. Stomata are small pores, typically on the undersides of leaves, that are opened or closed under the control of a pair...

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In this Experiment, students investigate the effects of ecological factors on the growth of Wisconsin Fast Plants, also known as rapid-cycling brassica (Brassica rapa L.). Treatments could include light, wind, herbivory, fertilizer, or insecticides. Variables to be measured could include growth (height, number of leaves, leaf area) or reproduction (number of flowers). Wisconsin Fast Plants have...

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This Issue focuses on a research article by Blaustein and Johnson (2003) that was published in Frontiers in Ecology and the Environment. The article discusses amphibian deformities, which may be related to a global decline in amphibians. By working with this paper and additional figures, students come to appreciate the complexity of biodiversity loss. Specifically, they gain an understanding of...

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